Thanks for feedback. I figured it wasn't cut and dry.
We have sent all communications about this over to our lawyer. Which now includes a letter from his lawyer. It intones that his client has tried for 2 days to get access to the records.
Our main concern in handing over the records would be if Mom then comes after us. Asking Mom if there is "any legal reason" he can't have access was the best idea I heard, but now we'll wait on our lawyer's pricey advice.
Thanks!
